What is the use of "summary"

Question

What is This Code and what is the benefits of this code

and depends on any version

  ''' <summary>
  ''' To Get Connection String
  ''' </summary>
  ''' <param name="I_ServerName"> Data Base Server Name </param>
  ''' <param name="I_DatabaseName"> DataBase Name </param>
  ''' <param name="I_ServerUser"> Server UserName</param>
  ''' <param name="I_ServerPassword"> Server Login Password </param>
  ''' <param name="I_sqlMode"> SqlServer Mode </param>
  ''' <remarks></remarks>